Trump, Macron and Erdogan clash overshadows NATO summit

US President Donald Trump and Emmanuel Macron exchanged fire over the future of NATO on Tuesday, as the French leader attacked Turkey and demanded the alliance rethink its strategy.The three-way battle overshadowed the start of the alliance's 70th anniversary summit in London, threatening to derail efforts to show unity in the face of Russia and China.In recent weeks Macron has tried to shake up the agenda of the meeting by demanding a review of NATO's "brain dead" strategy, but Trump -- who arr